Condenser



May 25 1926.

CONDENSER Filed Jan. 26. 1925 Patented May Z5, 1925i.

sYDNnY K. wILsON, or PHILADELPHIA, PENNSYLVANIA.

coNnnNsEn.

Application aiearanuai-y es, 1925. serial No. 4,883.

This invention relates to a condenser for use in radio receiving sets, and an object of the invention is to provide a condenser in which aV stationaryk and a movable cylinder are utilized, the movable cylinder being mounted for telescoping within the stationary cylinder for varying the capacity of the condenser, thereby ,providing a condenser which has practically a straght line effect from minimum to 'maximum capacity and vice versa, and one which will allow the Calibrating of wave length on any type of radio receiving structure.

A further object of the invention is to provide in a condenser as specied, a movable cylinder which is moved relative to the sta- `tionary cylinder by means of a threadable connection with a shaft, thereby permitting extreme delicacy and accuracy in the adjustment of the cylinders for regulating the capacity of the condenser and also providing a vernier condenser from maximum to minimum capacity, the accuracy of adjustment being controlled by the number of threads per inch on the threaded feeding shaft.

A further object of the invention is to provide a condenser as specified in which body capacity and the resulting undesirable noises and inaccuracy in the receiving set will be eliminated.

Other objects of the invention will appear in the following detail description, and in the accompanying drawings wherein:

Figure 1-is a longitudinal section through the condenser.

Figure 2`is a cross section through the condenser.

Figure 3-is a detail longitudinal section through t-he feeding sleeve. Y

Referring more particularly to the drawings,the improved condenser comprising a front plate 1 and a back plate 2 which plates are made of any suitable insulating material, such as balrelite or the like. The front and back plates 1 and 2 are connected by suitable clamping rods 3 which also serve as guide rods for the spider structure 4. The spider structure 4 has a plurality of guidingy bearings 5 formed on the arms 6 thereof, while a metal cylinder 7 of aluminum, brass of any other suitable material is carried by the perimeter of the spider structure. The cylinder 7 forms one of the adjustable lates which control the capacity ef the con ,anser while the stationary cylin j der 8 forms y or outwardly out of the cylinder 8.

the other of the co-operating members.v The cylinder 8 is also formed of aluminum, brass or lother suitable metal, and it is carried by the back plate 2 and is of slightly larger internal diameter than the external diameter of the movable or adjustable vcylind'er 7. Y

In the drawings, a cylinder 9, of glass or any other suitable dielectric material is illustrated, which is placed between the inner and outer surfaces respectively, of the cylinders 8 and 7. The hub 10 of the spider 4 is internally screw threaded and the threads co-act with the threads 11 on 12 which has its smooth end 18 mounted in a suitable bearing 14 in the baclr plate 2. The sleeve 12 is mounted upon a shaft 15 which is made of any suitable insulating material, such as bakelite or the like, and it is pinned thereon by means of a pin 16. A spring' 17 engages the pin 16 and the bearing 14 for holding the sleeve in position. The shaft 15 projects outwardly through the front plate 1 and is adapted to through the panel indicated at A of a radio set, and have a dial or knob B of approved construction on its outer end to facilitate rotation of the shaft 15 and sleeve 12 for moving the spider 4 and consequently the cylinder 7,. inwardly into One of the guiding rods 3 has a binding post 18 thereon to permit one connection with the condenser while the other connection may be made through a binding post 19 to the cylinder 8 or the wire maybe soldered or otherwise suitably attached to the cylinder.

ile in the foregoing description and in the accompanying drawings the improved condenser has been illustrated with only a single movable and a single stationary cylinder, it is to be understood that a plurality of movable and stationary cylinders may be provided if it is found necessary to do so, without departing from the spirit of this invention.

It is, of course, to be understood, that the invention may be constructed in various other manners and the parts associated in different relations, and therefore, -I do not desire to be limited in any manner, except as set forth in the claims hereunto appended.

lVhat I claim is:

1. In a condenser for yradio receiving structures, a front and back plate, acyln der of dielectric material between said. .trent a metal sleeve t" project 5 and back plates, a stationary metal cylinder surrounding substantially one-half of said dielectric cylinder, and a movable metal cylinder Within tbc dielectric cylinder 'for movement into or out ot the stationary metal cylindcr.

2. In a condenser for radio receiving structures, a front and back plate, a cylinder of dielectric material between said iront and back plates, a stationary metal cylinder surrounding substantially one-baliz o'l said dielectric cylinder, a movable metal cylinder Within tlic dielectric cylinder for movement into or out of the stationary metal cylinder, a shaft of insulating material, and a feed screw carried by said shaft, and means connecting said 'feed screw and movable dielectric cylinder for movement into or oui of said stationary metal cylinder, and guide rods carried by said front and back plates for guiding,` movement of said movable cylinder.

Il. ln a condenser for radio receiving apparatus, a front and back plate, a cylinder et dielectric material, o'i said "plates, a stationary metal cylinder surrounding substantially one-half ci' said dielectric cylinder, a movable metal cylinder Within said dielectric cylinder for movement into or out ol said stationary metal cylinder, a shaft of insulating material, a threaded sleeve mounted upon and rotatable with said sha-it, said threaded sleeve connected to said movable metal cylinder lor litting the movable metal cylinder, and `guide rods carried by said Jiront and baclr plate for guiding movement of said movable cylinder.

ln testimony Wliereo' I al'lix my sign ture.

SYDNEY K. W'lLSON. 

